JP2008112934A - 半導体記憶装置及びその製造方法 - Google Patents
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Abstract
【解決手段】半導体基板20と、ゲート電極34と、第1及び第2不純物拡散領域24a及び24bと、第1及び第2抵抗変化部22a及び22bと、第1及び第2主電極36a及び36bと、第1及び第2電荷蓄積部40a及び40bとを備えている。第1及び第2電荷蓄積部は、それぞれボトム酸化膜41a及び41b、電荷蓄積窒化膜42a及び42b、及びトップ酸化膜43a及び43bを順に積層して構成されている。また、第1主電極と、第1電荷蓄積部に設けられた電荷蓄積窒化膜との間の距離が一定であり、かつ、第2主電極と、第2電荷蓄積部に設けられた電荷蓄積窒化膜との間の距離が一定である。
【選択図】図1
Description
図1を参照して、この発明の半導体記憶装置を、半導体不揮発性メモリを例にとって説明する。
図4から14を参照して、この発明の半導体不揮発性メモリの製造方法について説明する。図4から14は、この発明の半導体不揮発性メモリの製造方法について説明するための工程図である。図4(A)は、素子分離膜が形成されたシリコン基板の概略的な平面図である。図4(B)は、図4(A)のX−X´線に沿って切った切断端面を示す図である。図4(C)は、図4(A)のY−Y´線に沿って切った切断端面を示す図である。同様に、図5(A)、図6(A),図7(A)、図8(A)、図9(A)、図10(A)、図11(A)、図12(A)、図13(A)及び図14(A)は、各工程で形成される構造体の概略平面図である。図5(B)、図6(B),図7(B)、図8(B)、図9(B)、図10(B)、図11(B)、図12(B)、図13(B)及び図14(B)は、それぞれ、図5(A)、図6(A),図7(A)、図8(A)、図9(A)、図10(A)、図11(A)、図12(A)、図13(A)及び図14(A)のX−X´線に沿って切った切断端面を示す図である。図5(C)、図6(C),図7(C)、図8(C)、図9(C)、図10(C)、図11(C)、図12(C)、図13(C)及び図14(C)は、それぞれ、図5(A)、図6(A),図7(A)、図8(A)、図9(A)、図10(A)、図11(A)、図12(A)、図13(A)及び図14(A)のY−Y´線に沿って切った切断端面を示す図である。
図15を参照して、この発明の半導体不揮発性メモリの製造方法の他の例について説明する。図15は、この発明の半導体不揮発性メモリの製造方法について説明するための工程図である。図15(A)は、概略的な平面図である。図15(B)は、図15(A)のX−X´線に沿って切った切断端面を示す図である。図15(C)は、図15(A)のY−Y´線に沿って切った切断端面を示す図である。
20、220 半導体基板
20a 第1主表面
21 素子分離膜
22a、222a 第1抵抗変化部
22b、222b 第2抵抗変化部
23 不純物低濃度拡散層
24a、224a 第1不純物拡散領域
24b、224b 第2不純物拡散領域
25 平坦領域
27 ステップ領域
28 ステップ部
29a 素子分離領域
29b アクティブ領域
31 シリコン酸化膜
32、232 ゲート酸化膜
34、234 ゲート電極
35 導電膜
36 主電極
36a、252a 第1主電極(ドレイン電極)
36b、252b 第2主電極(ソース電極)
40、40a、40b、240a、240b 電荷蓄積部
41、41a、41b、241a、241b ボトム酸化膜
42、42a、42b、242a、242b 電荷蓄積窒化膜
43、43a、43b,243a、243b トップ酸化膜
45 第1シリコン酸化膜
46 シリコン窒化膜
47 第2シリコン酸化膜
50 層間絶縁膜
70 シリコン窒化膜マスク
80 第2シリコン酸化膜
82、83 酸化膜マスク
140a 第1電荷蓄積部
140b 第2電荷蓄積部
224a 第1主電極領域(ドレイン)
224b 第2主電極領域(ソース)
Claims (4)
- 平坦領域と、該平坦領域よりも一方の主表面の他方の主表面に対する位置が高いステップ領域とが設定されている、第1導電型の半導体基板と、
前記ステップ領域の前記半導体基板の一方の主表面上に、ゲート酸化膜を介して設けられたゲート電極と、
前記半導体基板の一方の主表面側の表層領域のうち、前記平坦領域の一部分の前記ゲート電極を挟む位置に形成された一対の不純物拡散領域であって、前記第1導電型とは異なる第2導電型の第1及び第2不純物拡散領域と、
前記表層領域のうち、前記ゲート電極の直下の領域部分と前記第1不純物拡散領域及び第2不純物拡散領域との間に、前記平坦領域の前記第1及び第2不純物拡散領域に隣接する領域から、前記ステップ領域に設けられているステップ部の側面にわたってそれぞれ形成された、前記第1及び第2不純物拡散領域よりも不純物濃度が低い前記第2導電型の第1及び第2抵抗変化部と、
前記半導体基板の前記第1及び第2不純物拡散領域上に設けられた第1及び第2主電極と、
前記第1主電極及び前記ゲート電極間にこれらと隣接して設けられた第1電荷蓄積部と、
前記第2主電極及び前記ゲート電極間にこれらと隣接して設けられた第2電荷蓄積部と
を備え、
前記第1及び第2電荷蓄積部は、それぞれボトム酸化膜、電荷蓄積窒化膜及びトップ酸化膜を順に積層して構成されており、
前記第1主電極と、前記第1電荷蓄積部に設けられた電荷蓄積窒化膜との間の距離が一定であり、かつ、前記第2主電極と、前記第2電荷蓄積部に設けられた電荷蓄積窒化膜との間の距離が一定である
ことを特徴とする半導体記憶装置。 - 第1導電型の半導体基板の一方の主表面側に、第1の方向に延在して、平行かつ等間隔に複数の素子分離膜を形成する工程と、
前記半導体基板の一方の主表面上にゲート酸化膜、導電膜及び第1シリコン窒化膜を順次に形成する工程と、
前記第1の方向に直交する第2の方向に延在して、平行かつ等間隔にステップ領域を設定し、前記ステップ領域間の領域を平坦領域と設定する工程と、
前記第1シリコン窒化膜をパターニングして、前記ステップ領域の前記第1シリコン窒化膜を残存させ、かつ前記平坦領域の前記第1シリコン窒化膜を除去して窒化膜マスクを形成する工程と、
前記窒化膜マスクを用いたエッチングにより、前記導電膜をパターニングしてゲート電極を形成する工程と、
前記窒化膜マスク及びゲート電極をマスクとして用いたエッチングにより、前記平坦領域のゲート酸化膜を除去するとともに、前記平坦領域の半導体基板をトレンチエッチングして、前記半導体基板の一方の主表面側に台状のステップ部を形成する工程と、
前記平坦領域の半導体基板の一方の主表面上と、ステップ部、ゲート酸化膜及びゲート電極の側面上とに第1シリコン酸化膜を形成する工程と、
前記半導体基板の前記ゲート電極を挟む領域に、トレンチの底面である平坦領域から前記ステップ部の側面にわたって前記第1導電型とは異なる第2導電型の不純物を注入して、不純物低濃度拡散層を形成する工程と、
前記ステップ部、ゲート酸化膜及びゲート電極の側面の前記第1シリコン酸化膜上に、シリコン窒化膜を形成した後エッチングを行い、前記シリコン窒化膜を、ステップ部の側面に平行な平板状に加工して、電荷蓄積窒化膜を形成する工程と、
前記不純物低濃度拡散層の部分であって前記半導体基板の平坦領域の一部分に、前記窒化膜マスク及び電荷蓄積窒化膜をマスクとして前記第2導電型の不純物を注入することにより、不純物拡散領域を形成し、かつ、前記半導体基板の表層領域のうち、前記ゲート電極の直下の領域及び前記不純物拡散領域間の前記不純物低濃度拡散層の部分を抵抗変化部とする工程と、
前記不純物拡散領域、前記窒化膜マスク及び電荷蓄積窒化膜上に第2シリコン酸化膜を形成して、隣接するゲート電極間を埋め込む工程と、
前記第2シリコン酸化膜をパターニングして、素子分離領域上に前記第1の方向に延在する酸化膜マスクを形成するとともに、前記第2の方向に隣接する酸化膜マスク間の前記電荷蓄積窒化膜に挟まれる領域の半導体基板を露出する工程と、
前記ステップ部、ゲート酸化膜及びゲート電極の側面の前記電荷蓄積窒化膜上に、トップ酸化膜を形成する工程と、
前記露出した半導体基板上に、主電極を形成する工程と
を備えることを特徴とする半導体記憶装置の製造方法。 - 前記酸化膜マスクを、一のステップ領域から、前記第1の方向に隣接する他のステップ領域に渡って前記第1の方向に延在する短冊状に形成し、
前記酸化膜マスクは、隣接する平坦領域の一方を覆い、他方を露出し、
前記酸化膜マスクは、隣接する素子分離領域の一方を覆い、他方を露出する
ことを特徴とする請求項2に記載の半導体記憶装置の製造方法。 - 前記酸化膜マスクを、素子分離領域上に連続する帯状に形成する
ことを特徴とする請求項2に記載の半導体記憶装置の製造方法。
Priority Applications (4)
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JP2006296364A JP2008112934A (ja) | 2006-10-31 | 2006-10-31 | 半導体記憶装置及びその製造方法 |
CNA2007101126524A CN101174634A (zh) | 2006-10-31 | 2007-06-26 | 半导体存储装置及其制造方法 |
KR1020070063447A KR20080039193A (ko) | 2006-10-31 | 2007-06-27 | 반도체 기억장치 및 그 제조 방법 |
US11/848,944 US7423314B2 (en) | 2006-10-31 | 2007-08-31 | Semiconductor memory device and method for the same |
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JP2006296364A JP2008112934A (ja) | 2006-10-31 | 2006-10-31 | 半導体記憶装置及びその製造方法 |
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US (1) | US7423314B2 (ja) |
JP (1) | JP2008112934A (ja) |
KR (1) | KR20080039193A (ja) |
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-
2006
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-
2007
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- 2007-06-27 KR KR1020070063447A patent/KR20080039193A/ko not_active Application Discontinuation
- 2007-08-31 US US11/848,944 patent/US7423314B2/en not_active Expired - Fee Related
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US20080099831A1 (en) | 2008-05-01 |
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KR20080039193A (ko) | 2008-05-07 |
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